体温を適温に保つということは大切なことです。

tbd

It is important to maintain your body temperature at a suitable level.

旧システム用に書かれたソフトとの上位互換性を保つのは大切です。

tbd

It is important to maintain backward compatibility with software that was written to run on the former system.

ニューヨークはただ規模の点で長いこと孤高を保ってきた。

tbd

New York City has long been unusual because of its sheer size.

友人を作るのはたやすいが友情を保つのは難しい。

tbd

It is easy to make a man one's friend, but hard to keep him so.

名声を保つことは難しい。

维护声誉并非易事。

It's hard to maintain one's reputation.

It is hard to maintain one's reputation.

万一に備えて連絡をたもってください。

tbd

Try to keep in touch with me, just in case.

北極熊は、生きていくために体を適温に保ち、数日か数ヶ月もあくかもしれない食事の間持ちこたえられるだけの十分なエネルギーを蓄えねばならない。

tbd

To survive, the polar bear must keep its body at the right temperature and store enough energy to last between meals that could be a few days or a few months apart.

平静を保てないと君は地位を失うことになるよ。

tbd

You will lose your position if you don't keep your temper.

鼻の上でボールのバランスを保つのは難しい。

tbd

It's difficult to balance a ball on your nose.

彼女は落ち着きを保とうと努めた。

tbd

She tried to keep her presence of mind.